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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Reactive Uptake of Ozone by Aerosol-Associated Unsaturated Fatty Acids: Kinetics, Mechanism, and Products
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Reactive Uptake of Ozone by Aerosol-Associated Unsaturated Fatty Acids: Kinetics, Mechanism, and Products

机译：气溶胶相关的不饱和脂肪酸对臭氧的反应性吸收：动力学，机理和产物

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The heterogeneous reaction between ozone and oleic and linoleic acids, prevalent components of both marine and urban organic aerosol, were studied in a flow reactor using electron impact and chemical ionization mass spectrometry. Liquids and frozen liquids were used as proxies for atmospheric aerosol. The reactive uptake coefficients, γ, were determined to be (8.3 ± 0.2) * 10~(-4) and (1.2 ± 0.2) * 10~(-3) for liquid oleic and linoleic acid respectively and (5.2 ± 0.1) * 10~(-5) and (1.4 ± 0.1) * 10~(-4) for frozen oleic and linoleic acid, respectively. Although, the reactor-diffusive length is estimated to be rather small in the liquid experiments, <10nm, a clear indication of the participation of subsurface layers in the uptake is observed. This is in contrast to uptake by the frozen acids where the reaction is limited to the surface. Aldehydes were identified as the major volatile reaction products: 1-nonanal was detected following reaction with oleic acid, 2-nonenal, 4-nonenal, and 1-hexanal were detected following reaction with linoleic acid. The aldehyde yield, defined as the amount of the volatile product released relative to the ozone consumed, is dictated by its solubility in the liquid and frozen liquid acids. Azelaic acid was identified as a liquid-phase reaction product following the reaction with oleic acid. The implications regarding the atmospheric aging of aerosols with a fatty acid component are discussed.
机译：使用电子碰撞和化学电离质谱技术，在流动反应器中研究了臭氧与油酸和亚油酸（海洋和城市有机气溶胶的普遍成分）之间的异相反应。液体和冷冻液体用作大气气溶胶的代理。液体油酸和亚油酸的反应性摄取系数γ分别为（8.3±0.2）* 10〜（-4）和（1.2±0.2）* 10〜（-3），以及（5.2±0.1）*冷冻的油酸和亚油酸分别为10〜（-5）和（1.4±0.1）* 10〜（-4）。尽管在液体实验中估计反应堆的扩散长度很小，小于10nm，但可以清楚地观察到地下层参与了吸收。这与反应仅限于表面的冷冻酸的吸收相反。醛被确定为主要的挥发性反应产物：与油酸反应后检测到1-壬醛，与亚油酸反应后检测到2-壬烯醛，4-壬烯醛和1-己醛。醛产率定义为相对于消耗的臭氧而释放的挥发性产物的量，取决于其在液体和冷冻液体酸中的溶解度。与油酸反应后，壬二酸被鉴定为液相反应产物。讨论了具有脂肪酸成分的气溶胶在大气中老化的意义。

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